EP2470316A1 - Gasfeder zum verschieben eines feuerfesten absperrventils - Google Patents
Gasfeder zum verschieben eines feuerfesten absperrventilsInfo
- Publication number
- EP2470316A1 EP2470316A1 EP10742526A EP10742526A EP2470316A1 EP 2470316 A1 EP2470316 A1 EP 2470316A1 EP 10742526 A EP10742526 A EP 10742526A EP 10742526 A EP10742526 A EP 10742526A EP 2470316 A1 EP2470316 A1 EP 2470316A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- ram
- gas
- container
- gas spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000006835 compression Effects 0.000 claims abstract description 22
- 238000007906 compression Methods 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims description 6
- 230000036316 preload Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 62
- 230000007246 mechanism Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/40—Means for pressing the plates together
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/002—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising at least one fluid spring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/0209—Telescopic
Definitions
- This invention relates to gas springs for sliding refractory gate valves.
- Gas springs also known as Thermo Dynamic Elements, TDEs
- TDEs Thermo Dynamic Elements
- the aperture of the bore increases or decreases thereby determining the flow rate of the steel.
- the springs must supply sufficient force to ensure that molten steel cannot get between the plates (which is known as finning), which could then potentially lead to a breakout of molten steel, which can be extremely dangerous as well as costly.
- the sliding of the refractory plates is powered by hydraulics.
- a gas spring (TDE) consists essentially of a metal ram connected to a metal bellows (usually stainless steel), with an inert gas in a sealed chamber and applying pressure to the ram.
- the gas is inside the bellows which thus expand to extend the ram as the gas expands; in another form the bellows are sealed into an outer container and the gas is outside the bellows and ram and inside the container, thereby to compress the bellows and extend the ram as the gas expands.
- the springs need to be of compact design whilst providing adequate force. Gas springs have proven capable of satisfying this requirement.
- Gas springs have the advantage that at higher temperatures the gas pressure increases to apply a greater force on the sliding plates, thereby preventing any finning. They also provide an extra element of safety, since the normal failure mode is due to the bellows fatiguing. As such, it would be extremely unlikely for all the gas springs within the mechanism to fail at the same time, unlike other types of spring which may have a failure mode related to temperature and thus may all fail together at the same temperature.
- Known designs of gas spring can provide a guaranteed number of heats (cycles) at a maximum temperature of e.g. 500 0 C. However, there have been many cases where the gas springs have been operating in temperatures above 700 0 C.
- a gas spring for a sliding refractory gate valve comprising a container, a ram which is extendable relative to the container, a bellows connected at one end to the ram and at the other end to a part of the container, a gas within the container outside the bellows and acting to compress the bellows and extend the ram, wherein the ram has a blind internal bore and a mechanical compression spring is at least partially disposed in the bore so as to be interposed between the ram and the container and also acting to extend the ram.
- the invention allows the provision of a refractory gate valve gas spring of compact design which integrates an appropriate mechanical spring with the gas spring function.
- the invention provides the possibility of tailoring the force exerted by the gas spring at both higher and lower temperatures, thereby providing a gas spring which provides adequate force at lower temperatures but does not exert excessive force at higher temperatures.
- a gas spring can fail due to bellows fatigue. The failure would be instantaneous. Although the clamping force provided from the remaining gas springs within the mechanism would usually be sufficient to prevent a breakout, plate wear may become excessive due to the uneven clamping force and a chance of finning may hence arise.
- the mechanical compression spring provides a secondary force that does not rely on the gas as a spring medium and can supply a limited amount of force after the gas has been expelled, which may be sufficient to reduce the chance of finning.
- Figure 1 is a schematic section of an embodiment of a gas spring in accordance with the invention.
- Figure 2 is a schematic section of another embodiment of a gas spring in accordance with the invention.
- Figure 3 is a schematic section of another embodiment of a gas spring in accordance with the invention.
- Figure 4 is a schematic section of another embodiment of a gas spring in accordance with the invention.
- Figure 5 is a schematic section of the gas spring of Fig. 2 showing a stage of the assembly.
- Figure 6 is a graph showing the variation of force with temperature of a gas spring according to the invention in comparison to a prior design.
- the exemplary gas spring 10 comprises a metal tube 22, with a base 24 and guide bush 26 welded thereto to define a container 12.
- a ram 28 extends through an aperture in the guide bush 26.
- a stainless steel bellows 30 is welded at one end to bush 26 and at the other end to ram 28, thereby to define a closed or sealed space 14 together with the ram 28, tube 22, base 24 and bush 26, i.e. outside the bellows 30 and inside the container 12.
- the base 24 is provided with a filling aperture 32 and valve 34 whereby the closed space may be filled with an inert gas 33 under pressure, such as nitrogen.
- an inert gas 33 under pressure, such as nitrogen.
- the gas is indicated by dots in the Figure.
- the pressure of the gas acts upwardly as shown in the Figure on the ram 28.
- the ram 28 has a circumferential stop 36 for limiting the maximum extension of the ram, upwardly in the orientation shown in Fig. 1.
- the base 24 is provided with a threaded bore 38 which receives a reduced threaded end 40 of a guide retainer 42.
- the retainer has means for driving it into the thread 38, such as a slot 44.
- the retainer 42 guides and retains a mechanical compression spring 46 in the form of a stack of Belleville washers 48 made of a heat-resistant metal.
- Belleville washers are domed washers which can be stacked with the individual domes either upward or downward.
- the ram 28 has a blind internal bore 49, and the spring 46 is disposed partially within the blind bore 49 so as to be interposed between the ram 28 and the container 12.
- the spring 46 engages a step 50 on the underside of the ram 28, in the interior of the bore 49, to urge it in the same direction as the force of the gas pressure, i.e. upwardly in the Figure.
- Figure 2 shows an alternative design in which the retainer 42 is eliminated.
- a spigot 54 is formed on the base 24 and serves to guide and locate some of the Belleville washers 48. Others are located by the internal bore 49 and others are indeed located by both the spigot 54 and the bore 49.
- Figure 3 shows another design in accordance with the invention in which the retainer 42 or spigot 54 and washers 48 are replaced by a compression spring 46 seated in a circular groove 56 and engaging the underside of the ram 28, i.e. the blind end of the bore 49.
- the spring is fabricated in the form of a bellows 58, but alternatively a coil spring could be used.
- the mechanical compression spring 46 urges the ram 28 in the same direction as does the gas pressure.
- the other parts are similar to, or perform similar functions to, the equivalent parts in the Fig. 2 embodiment.
- FIG. 4 shows another design in accordance with the invention in which the base 24 has a raised nose 60 extending partially into the blind bore 49 and the mechanical compression spring 46 is seated on the nose 60 and thereby is disposed wholly inside the blind bore. This arrangement provides for the use of a shorter spring, which may be useful to give the required performance in certain applications, whilst also providing a very stable configuration against relative lateral movement of the various components.
- Figure 5 shows a stage in the assembly of the gas spring of Fig. 1.
- the guide bush 26, ram 28 and bellows 30 form a separate part from the rest of the device and are prefabricated.
- the spring 46 is assembled on the retainer 42 which is driven into the thread 38.
- the spring 46 is a stack of Belleville washers only indicated schematically and they are in their relaxed condition.
- a clamp is used to press the guide bush 26 towards the base 24 and during this process the step 50 comes into engagement with the spring 46 and compresses it. This applies a preload on the spring 46, resulting in the condition shown in Fig. 1.
- the bush 26 is then welded to the tube 22 and the sealed container can then be charged with gas.
- the force extending the ram results from both the gas pressure and the force of the mechanical compression spring.
- a mechanical spring of appropriate length can be employed whilst still providing a compact overall design.
- the properties of the mechanical compression spring and by selecting the initial gas pressure it is possible to tailor the initial force at room temperature, the force at higher temperatures, and the slope of the force/temperature curve.
- the increased gas pressure inside the new gas spring as the temperature increases is less than in a gas spring where the total force is made up of gas alone.
- the force/temperature curve can be manipulated to provide the desired shape.
- the force at ambient temperature on the new gas spring was split with 275 kgf provided by the mechanical spring (an alloy designed to withstand temperatures up to 700 0 C) and the remaining 225 kgf provided by the gas.
- the forces of the new gas spring were compared against a known gas spring without a mechanical spring. Both springs were taken up to temperature and compressed to their working length. The results in the table below compare the new gas spring with the known gas spring.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Springs (AREA)
- Sliding Valves (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL10742526T PL2470316T3 (pl) | 2009-08-25 | 2010-08-02 | Sprężyna gazowa do przesuwnych zasuw ogniotrwałych |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0914834.7A GB0914834D0 (en) | 2009-08-25 | 2009-08-25 | Gas spring |
PCT/GB2010/001460 WO2011023928A1 (en) | 2009-08-25 | 2010-08-02 | Gas spring for sliding refractory gate valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2470316A1 true EP2470316A1 (de) | 2012-07-04 |
EP2470316B1 EP2470316B1 (de) | 2015-04-01 |
Family
ID=41171890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10742526.6A Active EP2470316B1 (de) | 2009-08-25 | 2010-08-02 | Gasfeder für feuerfesten schieberverschluss |
Country Status (8)
Country | Link |
---|---|
US (1) | US8517358B2 (de) |
EP (1) | EP2470316B1 (de) |
CN (1) | CN102596450B (de) |
BR (1) | BR112012004299A2 (de) |
ES (1) | ES2538378T3 (de) |
GB (1) | GB0914834D0 (de) |
PL (1) | PL2470316T3 (de) |
WO (1) | WO2011023928A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2537386A (en) * | 2015-04-14 | 2016-10-19 | Nutberry Ltd | Gas spring |
CN106287011A (zh) * | 2016-08-29 | 2017-01-04 | 浙江奇爱管业有限公司 | 一种高防漏型燃气波纹管 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1438527A (en) | 1920-06-19 | 1922-12-12 | Bradford B Holmes | Vehicle air spring |
US2564394A (en) * | 1949-04-09 | 1951-08-14 | Shell Dev | Metallic coiled spring with protective cover |
CS209476B2 (en) | 1974-02-08 | 1981-12-31 | Zimmermann & Jansen Gmbh | Elastic element of the slide valve closure of the pouring ladles |
GB1518841A (en) * | 1975-04-29 | 1978-07-26 | Flogates Ltd | Sliding gate valves |
US4189073A (en) * | 1975-08-08 | 1980-02-19 | United States Steel Corporation | Spring element for use in sliding gate valve |
SU996768A1 (ru) | 1981-08-17 | 1983-02-15 | Волгоградский Ордена Трудового Красного Знамени Политехнический Институт | Пневмогидравлическа рессора |
DE3715038A1 (de) | 1987-05-06 | 1988-11-17 | Schaeffler Waelzlager Kg | Hydraulische spannvorrichtung |
US5027637A (en) | 1988-12-26 | 1991-07-02 | Nhk Spring Co., Ltd. | Die cushion for applying pressure to a press machine via gas pressurized push rods |
GB9509014D0 (en) * | 1995-05-03 | 1995-06-21 | Flogates Ltd | Improved sliding gate valve |
CN2526587Y (zh) * | 2002-01-25 | 2002-12-18 | 上海永鑫气体弹簧有限公司 | 气体弹簧 |
JP4288182B2 (ja) | 2002-04-22 | 2009-07-01 | シーメンス アクチエンゲゼルシヤフト | 流体のための調量装置、特に自動車用噴射弁 |
DE10324801A1 (de) * | 2003-06-02 | 2005-01-05 | Knöllinger FLO-TEC GmbH | Gießpfannenschieber |
JP2006242278A (ja) | 2005-03-03 | 2006-09-14 | Nhk Spring Co Ltd | ベローズユニットと、それを用いた気体ばねおよび懸架装置 |
CN201279584Y (zh) * | 2008-11-03 | 2009-07-29 | 秦秋来 | 一种钢包滑动水口机构的组合弹性元件 |
-
2009
- 2009-08-25 GB GBGB0914834.7A patent/GB0914834D0/en not_active Ceased
-
2010
- 2010-08-02 CN CN201080048186.8A patent/CN102596450B/zh active Active
- 2010-08-02 EP EP10742526.6A patent/EP2470316B1/de active Active
- 2010-08-02 ES ES10742526.6T patent/ES2538378T3/es active Active
- 2010-08-02 WO PCT/GB2010/001460 patent/WO2011023928A1/en active Application Filing
- 2010-08-02 US US13/392,742 patent/US8517358B2/en not_active Expired - Fee Related
- 2010-08-02 PL PL10742526T patent/PL2470316T3/pl unknown
- 2010-08-02 BR BR112012004299A patent/BR112012004299A2/pt not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2011023928A1 * |
Also Published As
Publication number | Publication date |
---|---|
GB0914834D0 (en) | 2009-09-30 |
CN102596450A (zh) | 2012-07-18 |
US8517358B2 (en) | 2013-08-27 |
EP2470316B1 (de) | 2015-04-01 |
ES2538378T3 (es) | 2015-06-19 |
PL2470316T3 (pl) | 2015-08-31 |
WO2011023928A1 (en) | 2011-03-03 |
CN102596450B (zh) | 2016-02-10 |
US20120217687A1 (en) | 2012-08-30 |
BR112012004299A2 (pt) | 2016-03-08 |
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